OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
Zeetings - Turn your presentations into interactive conversations
Synfig Studio - Just another WordPress site
Mentimeter - a web-based polling tool for workshops, conferences & events
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
SlideLizard - Powerpoint plug-in for live audience interaction